self.commentNumber=[[UILabel alloc]init];

self.commentNumber.numberOfLines=0;

self.commentNumber.text=[NSString stringWithFormat:@"%@",self.model.comment_num];

CGRect rectcomment = [self.commentNumber.text boundingRectWithSize:size options:NSStringDrawingUsesFontLeading|NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName : Font11} context:nil];

[self.commentNumber setFont:[UIFont systemFontOfSize:11]];

[self.commentNumber setTextColor:[UIColor grayColor]];

[self.commentNumber sizeToFit];

self.commentNumber.textAlignment=NSTextAlignmentCenter;

[self.contentView addSubview:self.commentNumber];

self.commentNumber.sd_layout

.rightSpaceToView(self.likeBtn,15)

.topSpaceToView(self.contentLa,11)

.widthIs(rectcomment.size.width)

.heightIs(rectcomment.size.height);

把賦值放在自適應的前面就可以了